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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34c47c9937361721d19602223c95cd099aea758d51ef339682c31759ddbd4f04' 
  AND token = 'wqFwWJ8wQRc7kX2sOLSbcGNCbAzikbhQnLSLREFAzjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}